Romans 7:6

‘But now we have been discharged from the law, having died to that in which we were held; so as to serve in newness of the spirit, and not in oldness of the letter.'

But now we (our ‘old man') have died with Christ, and we are therefore now discharged from the Law, having died to that in which we were held (note that here it is seemingly ‘the wife' (we) who has died in Christ's death). The coroner has, as it were, declared us dead and therefore untouchable by the Law. And the consequence is that we are free to serve in newness of Spirit, as our ‘new man' responds to and obeys the Spirit and walks step by step with Him (Galatians 5:16), and not in the oldness of the letter (by our old man striving to keep the written Law). That we are to see ‘the Spirit' as mentioned here as being the Holy Spirit, rather than our spirit (or included with our spirit), comes out in the contrast with the flesh (Romans 7:5). This is a contrast continually made by Paul (Romans 8:4; Galatians 5:16). We can compare the difference between ‘the Law written in the heart' (Jeremiah 31:31), that is, by the Spirit on the fleshy table of the heart (2 Corinthians 3:3), and the Law written in stone.